±15kV ESD Protected, 3.3V, Full Fail-Safe, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers

The Intersil ISL317XE are ±15kV IEC61000 ESD Protected, 3.3V-powered, single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. These devices have very low bus currents (+125mA/-100mA), so they present a true “1/8 unit load” to the RS-485 bus. This allows up to 256 transceivers on the network without violating the RS-485 specification’s 32 unit load maximum, and without using repeaters. For example, in a remote utility meter reading system, individual meter readings are routed to a concentrator via an RS-485 network, so the high allowed node count minimizes the number of repeaters required.

Features

• IEC61000 ESD Protection on RS-485 I/O Pins . . . . . ±15kV

- Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM

• Full Fail-safe (Open, Short, Terminated/Floating) Receivers

• Hot Plug - Tx and Rx Outputs Remain Three-state During Power-up (Only Versions with Output Enable Pins)

• True 1/8 Unit Load Allows up to 256 Devices on the Bus

• Single 3.3V Supply

• High Data Rates. . . . . . . . . . . . . . . . . . . . . . up to 20Mbps

• Low Quiescent Supply Current . . . . . . . . . . .800μA (Max)

- Ultra Low Shutdown Supply Current . . . . . . . . . . .10nA

• -7V to +12V Common Mode Input/Output Voltage Range

• Half and Full Duplex Pinouts

• Three State Rx and Tx Outputs Available

• Current Limiting and Thermal Shutdown for driver Overload Protection

• Tiny MSOP Packages Consume 50 Less Board Space

• Pb-Free (RoHS Compliant)

Applications

• Automated Utility Meter Reading Systems

• High Node Count Systems

• Field Bus Networks

• Security Camera Networks

• Building Environmental Control/ Lighting Systems

• Industrial/Process Control Networks